fix en-GB translation for pluralization
fix en-GB translation for pluralization

Change-Id: Ia8a4558821f714fb203986f0e27ec48e3b929fe4
Reviewed-on: https://gerrit.instructure.com/87046
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

grahamb/canvas-lms,HotChalk/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,venturehive/canvas-lms,fronteerio/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,grahamb/canvas-lms,HotChalk/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,fronteerio/canvas-lms,HotChalk/canvas-lms,fronteerio/canvas-lms,venturehive/canvas-lms,fronteerio/canvas-lms,SwinburneOnline/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,HotChalk/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,djbender/canvas-lms